two questions: hugetlb, how to set huge_bootmem_page->phys before gather_bootmem_prealloc()

From: Xishi Qiu
Date: Wed Aug 31 2016 - 04:27:59 EST

If the system is 32 bit, usually we will have a highmem zone.

I find gather_bootmem_prealloc() will free the huge_bootmem_page and
then prep the new huge page in CONFIG_HIGHMEM.

But alloc_bootmem_huge_page() we will use the beginning of the huge page
to store the huge_bootmem_page struct, so how to set huge_bootmem_page->phys?

commit(ee8f248d266ec6966c0ce6b7dec24de43dcc1b58) add phys addr to struct

Another question, commit(8b89a1169437541a2a9b62c8f7b1a5c0ceb0fbde)
update the interface, and the following code actually fix a bug too, right?

We should use phys instead of virt when calling free_bootmem_late(),
But it has not reported to stable.

- free_bootmem_late((unsigned long)m,
- sizeof(struct huge_bootmem_page));
+ memblock_free_late(__pa(m),
+ sizeof(struct huge_bootmem_page));

Xishi Qiu